mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, and amorphous crystal structure.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, and amorphous crystal structure.
Formation & geological history
Formed as a secondary mineral resulting from the weathering and oxidation of iron-bearing minerals in sedimentary, metamorphic, and igneous environments.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment known as ochre.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides, primarily goethite and lepidocrocite.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown or brownish-orange streak. Found worldwide in oxidized iron deposit zones.
